Biopolymers
- Enzymes - biological catalyst
- Regulators of catalysis - hormones
- Transport and store O2, metal ions, sugars, lipids, etc
- Contractile Assemblies - muscle fibers, separation o chromosomes, etc
- Sensory - Rhodopsin, nerve proteins
- Cellular defense - immunoglobins, antibodies, killer T cell, receptors
- Structural - collagen, silk, etc.